Machine for cutting threads on tubes



P. TAUREL MACHINE FDR CUTTING THREADS 0H TUEEIS 3 Sheets-Shem N L/EN TORPam/{ Fkam I I I P. TAUREL Aug. 4, 1931.

MACHINE FOR CUTTING THREADS ON TUBES Filed July 6, L329 3 Sheets--$heei:"AUREL MACHINE FOR CUTTING THREADS ON TUBES Files: July 6, 1929 3Sheets-Sheet 3 Patented Aug. 4, 193i PATENT OFFICE PAULIN TAUREL, OFROMAINVILLE, FRANCE MACHINE FOR CUTTING THREADS ON TUBES Application.filed July 6, 1929, Serial No. 376,376, and in France December 20, 1928.

In preparing tubes used in apparatus serving, for example, for centralheating, the titters have at their disposal a screwing machine with twoor four arms, which is manipulated by two or three men, one of whompushes against the die to cause it to take a grip of the end of thetube. This work is long and.

tedious.

here it is decided to go the expense of transporting a screwing machineto the work, this transport is very expensive in View of the fact thatexisting machines are not practically dismountable.

The primary object of this invention is the provision of a machine forreadily cutting threads on large tubes, said machine being adapted to bedemounted or detached in component parts for transportation, each by asingle individual.

Other objects of the invention are the provision of a machine forcutting threads which permits cutting of the thread and fitting of acoupling without removing the tube from the machine, eliminates manualguiding of the die at the start of the cutting operation and permitscutting any pitch or type of.

thread on the tube.

This machine comprises the following principal parts:

(a) A vise-like member holding the pipeto be threaded; (b) controllinggears of the screw stock, these gears being of two speeds and working byfriction; (0) a gear case capable of swivelling after the manner of agrate door and enclosing the said gears and also the frictionarrangement; (d) a spring pusher acting on the stock pressing thislatter against the tube to be threaded in order to force the stock onthe tube.

The friction arrangement mounted on the control avoids any breakage inconsequence of undue force exerted on the handle.

Furthermore, the gearings are perfectly equalized from the point of viewof the forces so as to do away with a large part of the friction.

This invention will be hereafter described, as an example with referenceto the annexed drawing, in which:

Fig. 1 is a cross section of the machine on the line II of Figure 2;

Fig. 2 is a complete plan;

Fig. .3 is a side View;

Fig. 4 is an end view of the case, the front 11.1 plate being removed; v

Fig. 5 shows the same case in horizontal section; I

Fig. 6 is a section of the case through-the axis of the machine;

Fig. 7 is a detail in horizontal section of the friction arrangementapplied to the control gears of the stock;

Fig. 8 is a horizontal section of the spring push used in this machineand having for its object to press the die against the tube which to bescrewed;

Fig. 9 shows a back end view of this same push.

In these various figures, the same reference letters indicate the sameparts.

As will be seen on the drawing this machine comprises a frame or base aon which the two jaws I) of a vise are capable of sliding laterally,simultaneously and with the same displacement but in oppositiondirections one to the other under the action of a control cross thread 0in such manner as to clamp the tube cl to be threaded or to disengage itas desired. This screw, suitably carried, is threaded half right hand,and half left hand with the same pitch, and is manipulated by means of adouble lever c mounted thereon. In this manner the tube (Z to bethreaded is always held in the axis of the machine whatever may be thediameter of the tube.

On the two sides of the base a and behind it are situated supports 6 eintended to receive on one side a sliding arm f, and on the other side arod g.

The sliding arm f is tubular, and its support forms a. bush. The slidingarm f has two pins f and 7. Pin f is fixed and prevents arm f from beingextracted from the socket pin f is in arm f on the other side of bracket6, insures firm positioning of said arm and may be withdrawn to permitsliding arm 7 to be moved back through socket e. The rod 9 has a crosssection in the form of two tubes connected in parallel by a vertical riband is swivelled on its support 6 forming an arc, by means of a verticalaxle h.

In front, the arm 7 and the connector 9 support by means of two lugs 2'the case 2' containing the gears which rotate the stock.

The arm f is connected to the said case i by two vertically oppositebolts 9', Whilst the connector g-is-at'ta'ched to the same case by averticle axle k.

The case 2' contains two sets of parallel gears, the one controlling andthe other controlled. These sets are perfectly equalized in order tosuppress a large part of the friction. v

For slow speed, a small central pinion Z is operated, and this aetu-a'te's two large symmetrical pinions m m actuating on their part, bymeans of their axle-n, 0 the set of controlled s ar M 9- For high speeda medium pinion ris rotated, this actuating the two large pinions m mwhich actuate in their turn, by means of their axle 0 0 the set ofcontrolled gears I a This change of speed is obaine'd directly fittingthe axle of the iiy-wheel 8 either in theta-net P of the small pinion Zor in the barrel 1" of the medium pinion 1 these barreisbeing mounted inball bearings.

The large pinions m m of the set of controlling each comprise a toothedwheel friction mounted at m 972?, Fig. 7, to avoid tlie-l'neakage whichmight be caused by too great an effort exerted on the flywheel s.

The set of controlled gears comprises the two small symmetricalpin-ionsp 79 corresponding respectively to the Large pinions m m andmounted on the same axle.

The 'pinion's p 79 engage with the large centrar pinion g;

The large central pinion g of the set of controlled isconnecred hy astrong central' journal t" with a; fork intended to carry with it thestock 4;.

This stock is preferably provided with a chaser and arms,'t-he latterabutting against tliebranches ofthe fork a to carry it around. Thepusher interposed betweei'i the stock *0 and the central journal 6' iniudes a kind of sleeve provided with two bored lugs through which passscrews in said journal.

This sleeve is provided with sii'ding studs connecting this part with awasher or ring a which is subjected to the action of the spiral springsThis ring, under the pressure of the springs forces the stock 1) on tothe tube to be threaded.

As the threading is eiiect'ed by the turning of'th'e flywheel s'the armsof the stock -vsli'de along thebranches of the fork u.

The operation of the machine for cutting threads is as follows:

The tube dis clamped between the aws b so that the end to be threaded iswithin the normally extended position of the stock 1), the stockassembly now being in the position shown in dotted lines in Fig; 2. Thestock assembly is then swung about vertical axle is into the positionshown in solid lines in Fig. 2, a slight pressure being exerted on thecase 2' to compress springs 50 of the pusher so that bolts may be put inplace. Rotation of the fiy-wheel 5 causes rotation of the stock 41 andcutting of the thread on the tube cl.

To make the machine adaptable for cutting 0d the end of tube (Z, theconnector 9 is hinged at axle h so that the stock assembly can be swungback to unmask the whole projection of pipe (5 beyond the jaws b. Theslidingari'n finay alsobe pushed back after Wilhdrawing pin f so thatthe cutting of the tube wil-l'not be impeded.

All the parts comprised in this machine may be taken down in order tofacilitatecarrings. The parts can be fitted togetheragain ins'tantlwithout an difficult The shapes, details, accessory parts, mate'- rialsand dimensions of this machine may of course be varied.

"hat i claim is I A; machine for cutting threadson a tube compri ing acase hingedly mounted, a gear mounted in said case, driving gears ofer'e'nt engaging said gear train, a fork mated by said gear train,,a diestock actuated by said fork and a push member resilurging said die stockon said tube.

2. A machine for cutting, threads on a tube comprising a: case hinge'dlymounted, a gear iLiiiGUlltQ'Cl in said case, acentral journal .ated bysaid gear train, a fork mounted on :aid iourn'al, a die stock actuatedby said fork adapted to slide in: an axialdirection, a ring abuttingsaid die stock, a sleeve attached to said journal and provided withholes, studs on said ring sliding in said holes and springs between saidring and said sleeve forcing the same apart.

3. A machine for cutting threads on a tube coniprisi g controlling gearsand. a set of controlled gears mounted insaid case, two large piniongears in said set of controlling gears, each comprising a center piece,a. rim and friction means,.a central journal actuated by said controlledgears, a fork mounted on said journal, :2 diestock actuated by said forkand adapted to sl de in an axial direction, a ring abutting said diestock, a sleeve attached to said jourual and provlded with holes, studson said L ring sliding in said holes and springs between said ring andsaid sleeve forcing the same apart.

The foregoing specification of my improved machine for cutting threadson tubes signed by me this 24th day of une, 1-929.

PAULIN TAUR-EL.

a case'hingedly mounted, a set of l

